Actor and director Matt Damon, who is co-founder of Water.org, a nonprofit organization that works to bring clean water to those who don't have access to it, is the latest to take the ALS Ice Bucket Challenge.

"This is truly toilet water," he said in the clip, kneeling to scoop some straight from the bowl into his bucket. "I've been collecting it from various toilets throughout the house."

"Keep in mind that the water in our toilets in the West is actually cleaner than the water that most people in the developing world have access to," he explains in the video. "So as disgusting as this may seem, hopefully it'll highlight the fact that this is a big problem, and together we can do something about it."

After taking the plunge, Damon nominated George Clooney, Bono and New England Patriots quarterback Tom Brady to take the plunge.

Damon was challenged by Jimmy Kimmel and Ben Affleck to take the ALS Ice Bucket Challenge. He said since he didn't accept the challenge in the 24-hour window, he would also "pay the fine" and make a donation.